Filter-pot press



April 22, 1930. 5, E T 1 ,755,353

FILTER POT PRESS Filed NOV. 29, 1927 3 Sheets-Sheet l April 22, 1930. L, s, WEBER-r 1355,33

FILTER, POT PRESS Filed Nov. 29, 1927. 3 Sheets-Sheet 2 Leslie flbabbrl? Zzyiuly Mr J.

April 22, 1930. L. s. HUBBERT FILTER POT PRESS Filed Nov. 29, 1927 3 Sheets-Sheet 3 tPatented Apr. 22, l930 UNITED STATES,

PATENT OEFICE,

menu: S. nunnnnr, or EDISON, 01110, nssrenon T run HYDRAULIC PRES-S MANU- rac'ruame COMPANY, or MOUNT GILEAID, 01110 1 FILTER-POT PRESS Application filed November 29, 1927. 7 Serial No. 236,517.

This invention relates primarily to certain improvements upon the typeofpress disclosed in patent to Stevenson N0. 1,40ei,l90 granted January 24, 1922. The fundamental' purpose of the improved press is broadly the same as that covered by this patent. Generally speaking, the press is designed for the separation of liquid and solid portions of fluid in the pressing operation from left to right .is a single or half plunger 1, 1 This is adapted vor semi-fluid materials, the consistency of 10 which is such that it can be handled originally by pumping. Thispress ordinarily may take the placeof two or more types of machines such as an ordinary plate and frame style of .filter and an ordinary hydraulic press for extracting the bulk of the liquid which still remains in the filter cake after the filtering operation has been carried to the greatest possible extent. The improvements which constitute the present invention relate to the means for holding together the pots and adjacent plungers and the means by which the press cake may be ejected after. the completion pressing operation. A

There is also disclosed a specificitype of filter member comprising drainage plates an of the filter pads which are held together and assembled in a particular manner.

Further detail features ofrthe invention 3 will be apparent from the following description and the appended claims.

In the drawings: I Figure 1 is a top plan view of they press. Figure 2 is a side elevation of the same.

Figure v3 is an end view taken from the right hand end of Figures 1 and 2.

Figure 4 is a transverse section. Figure 5 is a top plan of-one pot andthe plungers at each side thereof. 40 Figure 6 is a horizontal section throughthe same.

Figure 7 is a section on the line 77 of Figure 5.

Figure 8 is a detail section on anenlarged -scale showing llle construction 'of the filter member.

The press comprises apress head A supported by a base B and a resistance head 0 supported by a smaller base D. The two heads are connected together and properly spaced by strain rods Thetwo base members are also connected together by longitudi- .nal members F. Associated with the press head A is a'hydraulic cylinder G in which operates the usual press ram and, if desired, theremay be employed a small push back cylinder H as in the prior patent.

Connected to the press ram which moves to fit into the potz2 and slide therein. The right hand face of this plungeris equipped with drainage plates and filter pad as hereina'fter described. Each pot comprises essentially a heavy steel ring open on both faces and having lugs for a purpose hereinafter set forth. The right hand opening on the first pot 2 is closed by the next plunger 3 which, however, doesnot enter the right hand opening of the first pot but seals flush against the rim thereof. This plunger lies intermediate between the first pot 2 and the second pot 4 and is, therefore, double ended, both faces being provided with the drainage plates and filter pads. The right hand end of this plunger enters the left hand opening of the second pot.

' This alternate arrangement of pots and intermediate plungers is continued until the right hand opening of the last pot is closed by' a single ended plunger which slides flush against the right hand end of the pot and this last plunger is attached to the stationary end member or resistance head 0 of the press.

Each plunger is chambered as shown at 7 for the circulation of heating or cooling medium wherever temperature treatment is required. Each plunger is provided with These ductsthe liquid from one chamber to the next and permits the filling of all pots.

\ At'the sides thereof each plunger is pro-' vided with lugs 17 and the pots with similar lugs 18. A locking "bolt 19 is pivoted on a pin 20 in each lug 18 and can be swung so that the bolt will engage in a U-shape cutout 21 in the lug 17 of the plunger. In Figure 5 the upper bolt is shown 1n open position while the lower bolt is shown in looking position. Each bolt is provided with a nut 22 by means of whichthe plunger may be drawn tightly against the right hand face of its associated 0t. i p The working faces of the plunger members are provided with vertical drainage grooves '23 and the filter members are attached to these faces of the plungers, the

plungers thereby constituting supports for the respective filter members. Lying against the face of the plunger is arelatively thick plate 24 provided with large openings there- 111.

' thinner metal plate 25 which is provided with much smaller openings. On the other side of this metal plate is the filter pad 26 which may be formed of felt or other suitable filter medium. Lying on the other surface of the filter pad is a metal plate 27 having relatively large openings therein which are tapered toward the filter pad. All of these parts are held firmly together by means of screws 28 which screw into the plunger members.

connected to a cross head 38. .These rods pass through the lugs 17 and 18 on the pots and plungers and the pots are provided with' ushings 39'to engage the rods. The rods 37 have portions-40 which are reduced in size .and in which may be positioned keys 41, one

- of which is-clearly shown in Figure 7. These keys areof such size that they will not pass through theopenings in the lugs 17 and 18 and-therefore any desired plunger or pot or serles thereof may be given a movement'in' eitherdirection with. the rods 37 by placing the keys, 41 in the proper position;

The lugs 17 -and 18 also provide means which engage track shoes'42 carried by the connecting members F. These shoes may be easily renewed when they become'yvorn.

It is believed that the operation of 'the press will be apparent from the previous descriptionflout it may be brieflylecapitulated.

In contact with this plate is a muchmamas pumped into the interior. of the press under pressure. The initial separation of the liquid and solid portions will take place by ordina the filter under the pump pressure while the solid portion is retained in the cavities of the filter action, since the liquid will pass throng pots. This is carried on until the pressure limit of the pumping operation has been substantially reached. The valve 15 'will then be closed. Each pot now contains a mixture of liquid and solid portions but of an entirely different ratio from the original mixture. If

the original contains 10% of solids, the mixture remaining in the pots at the close of the filter operation may be as much as .40 or 50% solids.

'Hydraulic pressure is now applied to the ram and the pressure is transmitted from the first lunger to the material in the first pot and t rough the material to the next plunger and'to the material in the second pot. The

pots themselves are merely floating members but the left hand end of each plun er is locked against the right hand face 0 each pot as set forthabove. It is obvious that the pressure will be applied to the material in all of the pots by the above operation and the plungers and pots will travel toward the right, sliding on the rods 37'and track rails 42.

Whenthe pressing operatioil is completed, the bolts 19 are moved to unlocked position and the press ramwill be returned to its left hand position. This will result in moving the plunger which is attachedto the press ram to the left and the first pot may move therewith. Keys 41 are now inserted at the right hand side of the pot and movement is given the rods 37 under hydraulic pressure which will move the first pot to the left over the first plunger and since the right hand opening of the pot is now free since the next plunger is disconnected there rom, it is obvious that the press cake will be ejected from the first pot which will slide over the first plunger. By similar appropriate manipulation of subsequent pots and plungers through. the steps of placing the keys 41 in the proper positions,'the press cake will be ejected from all the pots. Thereafter the plungers maybe returned to pressing position by the same hydraulic system but at this time the keys will be placed in position on the opposite side of ward toward the resistance head ofothe press It will be obvious that the invention provides a very simple and eflicient system for locking together the pots and lungers during the pressing operation and also permitting the same to be unlocked readily when it is desired to remove the press cake. The double acting hydraulic system by means of the rods 37 and associated parts provides a rapid and simple mechanism for removing the press cake. I The particular construction of BE 2 The valve 15 is opened and the material is filter pads orelements is also found be exthe pot lugs so thatthe pots are pulled forceedingly eflicient. It is obvious that details of the construction may, bevaried in the precise form and arrangement thereof withoutin any way departing from the spurt of the invention which is to' be regarded as limited only by the scope of the appended claims.

I claim as my invention:

1. A filter pot press comprising press heads, a series of alternating hollow pots and plungers interposed between said press heads, hydraulic means for moving the pots and plungers in one direction during the expressing operation, lugs on said pots and plungers, rods passing through said lugs, hydraulic means for moving said rods, and means for connecting pots or plungers separately to said rods to move therewith to remove the press cake.

2! A filter pot press comprising press heads, a series of alternating hollow pots and plungers interposed between said press heads, hydraulic means for moving the potsand plungers in one direction during the expressing operation, rods passing through lugs on said pots and plungers, and means for causing any desired pot or plunger to move with said rods.

3. A filter pot press comprising press heads, a'series of alternating hollow pots and plungers interposed between said press heads, hydraulic means for moving the pots and plungers in dne direction during the expressing operation, rods passing through lugs on said pots 'and plungers, means for causing any desired pot or plunger to move with said rods, and double acting hydraulic means for moving the rods in either direction.

4. A filter pot press comprising press heads, a series of alternating hollow pots and plungers interposed between said press heads, hydraulic means for moving the pots and plungers in one direction during the'expressing operation, lugs on said pots and plungers, rods passing through said lugs, said r0 having portions of smaller diameter, and keys adapted to be placed on said portions of plate adjacent the other face of said layer of filtering medium and having large tapering openings.

7. In a filter'pot press,

plate with large openings adjacent said face, a filter plate with much smaller openings next to the first plate, a layer of filtering medium, a filter plate having large tapering openings, and means for holding said elements in close assembly.

8. A filter pot press, including in operative assembled relation a plunger having vertical drainage grooves on one face thereof, a filter plate with large openings adjacent said face, a thin filter plate with much smaller openings next to the first plate, a'layer of filtering medium having one of its faces adjacent said thinplate, and a thick filter plate adjacent the other face of said layer of'filtering medium having large openings tapering toward the filtering medium.

9. A filter pot press comprising press heads, a series of alternating pots and plung ers interposed between'the pre ss heads, a lug a plunger having drainage grooves on one face thereof, a filter on each of said plungers having an opening therein, a swinging bolt on each pot adapted to pass through the associated lug opening,-

nuts carried by the respective bolts for clamping the pots and plungers together hy draulic means for moving the pots and plungers in one direction during the expressing operation, other lugs on said pots and plungers, rods. passing through said other lugs, hydraulic means for moving said'rods, and means for connecting the pots and plungers to the rods for movement therewith.

In testimony whereof, I havehereunto subscribed my name. i v

LESLIE S. HUBBERT.

smaller diameter f to engage an element of the press and move it when the rods are moved.

5. In a filter pot press, a filter member comprising in assembled operative relation a layer of filtering medium, twometal plates having openings of different size on one side a metal plate having large tathe other side thereof, and a support for said elements.

6. A filter pot press, including in operative 1 assembled relation a plunger having drainage grooves on one facethereof, a filter plate with large openings adjacent said face, a second filter plate'with muchsmaller openings next to the first plate, a layer of filtering medium having one of its faces adjacent said second filter plate, and a third filter 

